| stiff(adjective, set, hard, firm, careless) |
| stony(adjective, set, hard, firm, careless) |
| stubborn(adjective, hard, careless, indifferent, cruel) |
| thick-skinned(adjective, hard, careless, indifferent, cruel) |
| unbending(adjective, hard, careless, indifferent, cruel) |
| unfeeling(adjective, hard, cool, careless, indifferent) |
| unyielding(adjective, firm, stiff, rigid) |
| accustomed(adjective, hard, unfeeling, unsympathetic, established) |
| apathetic(adjective, hard, cool, careless, indifferent) |
| backed |
| benumbed(adjective, hard, unfeeling, unsympathetic, hardened) |
| blind to(expression, adjective, hard, careless, indifferent) |
| brassy |
| brazen |
| calcified |
| calloused |
| careless(adjective, hard, indifferent, cruel, apathetic) |
| chutzpadik |
| cold(adjective, hard, cool, careless, indifferent) |
| cold-blooded(adjective, hard, cool, careless, indifferent) |